Phonographic record mount



M 3l, 1936 HF F M" GRAMANN n ZyB- PHONOGRAPHIC RECORD MOUNT l Filed Nov. 22, 1934Y 2 sheets-sheet 1 az 55 54 53" Ariola/my' Mmh 3l, 1,936`l H. F. M. GRAMANN 29036,@4@

PHONOGRAPHI C RECORD VMOUN'I" Filed'NoV, 22, 1934 2 Sheets-Sheet 2 A TTOR/VEY Patented Mar. 31, 1936 UNITED STATES PATENT `OFFICE PHONOGRAPHIC RECORD MOUNT Application 4November 22, 1934, Serial No. 754,229

12 Claims.

This invention relates to phonographic record mounts, .and more particularly to .improved means for mounting .cylindrical phonographic records for rotation. While not in all its aspects limited ..5 thereto, the invention has been particularly illus trated .and described in connection'with a phono- .graphic record resurfacing machine.

fA .common form of record mount is one which lincludes sa mandrel yadapted to carry the record lfl and :supports adapted to engage or cooperate with the mandrel respectively .at or near the opposite ends thereof to provide .bearings therefor. vObviously one of these supports must be disengageable from the mandrel at times to permit removal from 112' the mandrel of ,one record `and the application thereto of another. It is a broad object of my invention to provide an improved disengageable lsupport forone end of the mandrel.

In order that the disengageable support, when zo moved `tc mandrel supporting position, may engage the mandrel intimately, the suggestion has .been made of resiliently mounting on this support the bearing device proper-i. e., that `portion of the support Which actually contacts with the 25 `mandre'l--thereby providing a bias of the bearing device `against the mandrel as the support is brought intoimandrel supporting position. It has ybeen found, however, that this bias during rotation ofthe mandrel, will promote undue Wear of .the bearing device vand the -device-engaging mandrel portion, 'is likely to result in binding and is otherwise objectionable. It is another object of my invention Ato eliminate Athese objectionable effects, while retaining the salient advantages of 35 the biased bearing device arrangement.

It lis .a more specific object of my invention to provide improved means for locking the bearing device in proper mandrel engaging position.

Still another object of my invention is to pro- 40 vide for the bearing device a locking means automatically operative at appropriate times.

Other and allied objects and additional features .of my invention will more fully appear from the following description and the appended claims.

In the detailed description of my invention, hereinafter .set forth, reference is had to Vthe laccompanying drawings, in which:

Figure 1 is a .plan View of a record resurfacing machine in which is incorporated my invention in one form;

Figure 2 is a fragmental right-hand end .elevation View, partly in section, of the machine shown Vin Figure 1;

.Figure 3 is .an enlarged plan view, partly in secvtion,of the right-hand end portion of the machine shown in Figure 1;

Figure 4 is a'vertical cross-.sectional View taken on the line 4-4 of Figure 3, but with parts vshown in full or in front elevation.; i5v

Figure 5 is a vertical cross-sectional View, partly in elevation., of the bearing device proper `which is shown in elevation in Figure 4;

Figure 6 is a simplified front elevational View, partly in section :and partly broken away, of a im record resurfacing machine generally similar .to that shown in Figure "1, but in Which is embodie a modified form of my invention;

Figure 7 is an elevational View, partlyin section, of the end gate and certain associated parts .of 15 the .machine shown in Figure 6 andas Viewed from the left of the .end gate in Figure i6;

Figure 8 is a plan View of the structure shown in Figure '.7'; and

Figure 9 is a sectional View, partly in elevation, 20 taken along the line 9-9 of AFigure 8.

Reference being had :to Figures l, 2 and 3, Va base I is provided with lefthand standards 42 .and 3, righthand .standards 4 and V'.i, .and an .intermediatestandard 44. Standard 3, together with a .conically pointed bearing stud secured therein, forms a stationary ,support for the left-hand end of a mandrel II. The mandrel illustrated comprises a substantially cylindrical record-carrying portion lII located to the :right of standard 44, 30 and a shaft 9 secured to and co-axial with the portion II". The shaft 9 extends through ya slightly oversize `hole 43 in standard 44 to the stud V3!! which it engages by Virtue of a conical recess 9 provided in its lefthand end. A collar 35 I Il secured to .the shaft 9 just to the left of standard 44 maintains the mandrel in loose engagement with the stud 30 when the right-hand mandrel vend support, hereinafter described, is disengaged from the mandrel, under which -circumstances the shaft 9 rests on the bottom of the hole 43 and the mandrel is maintained in approximately its normal horizontal position. A cylin- Y drical record I2 may then be slid leftward on to the mandrel portion .I I', which lit is `adapted fric- 45 tionally to engage by virtue of a slight rigltward taper of both the portion III and the record bore, or slid rightward thereof. vThe record carrying mandrel portion II terminates at its right-hand extremity Ain a generally disc-like member :I I', 50 in the center of the outer surface of which is provided a conical recess II. The proper .engage` ment of the mandrel by its ,right-hand Vend supportis eifected .by bringing into engagement with the recess II" a conically pointed bearing stud 3| which forms a portion of such support and is hereinafter described in detail. When this engagement is effected the mandrel is wholly supported by the bearing studs 30 and 3l, is free of engagement with the wall of hole 43, and is accurately horizontally aligned and adapted for rotation.

The mandrel II is adapted to be rotated by means such as a motor below the base I (not shown), operative connection of the motor to mandrel shaft 9 being established as by a belt 2I and a shaft-borne pulley 22. In the illustrated machine the record surface is intended to be Shaved during rotation of the mandrel, and for performing this function there is provided a tool such as knife 26. This tool is carried by a tool bar 25 adjustably mounted in a boss or projecting portion 1 provided on the arm 1l of a carriage 1. This carriage is slidably mounted on the carriage rod 6, which is shown disposed behind and parallel to the mandrel I I and which is terminally mounted in standards 3 and 5. The arm 1 is approximately semi-circular in side elevation, and extends forwardly over the mandrel I I to engage at its forward extremity the top of a front guide rail 35 which projects upwardly from base I in front of and parallel to the mandrel II. The forward end portion of the arm 1 may be formed as a weight 8 to insure positive engagement of the corresponding arm extremity with the top of rail 35 and thereby establish a normal angular position for the entire carriage 1 about the rod 6. The knife 26 may be so adjusted that when the carriage occupies this normal angular position the knife will engage the record surface to the desired depth (means for this adjustment not being required to be shown herein) The arm 1'l may be lifted, however, to rock the carriage 1 about the rod 6 and thus disengage the knife 26 from the record surface.

It is contemplated that the knife 26 will traversev the record surface longitudinally of the record during rotation of the latter. To this end there is provided a feed screw I3 parallel to rod 6 and journalled on suitable bearings carried by standards 2 and 4. The feed screw is rotated during mandrel rotation by a belt I8 which passes over a feed screw-borne pulley I9 and a shaftborne pulley 20. Arranged to engage the feed screw I3 when the. carriage occupies its normal angular position about rod 6, and to disengage the same when arm 1" is lifted, is a feed nut I4, this nut being secured to the carriage by an arm I5 which is affixed to an extending portion I6 of the carriage. Therefore when the knife 26 is in cutting position and the mandrel II is rotated, the carriage 1 and hence the knife, will move steadily in a direction longitudinal of the record, thus causing the knife to take a uniform cut from the entire outer cylindrical surface portion of the record. Material thus cut or shaved from the record may drop through an aperture 28 in the base I and into a suitable receptacle (not shown) beneath the base.

The conically pointed stud 3 I, which is adapted to engage the recess II at the right-hand extremity of mandrel II, is carried by a swinging gate 32. This gate is pivoted to a boss I formed on the base I, and is closed, as illustrated in Figure 1, by clockwise movement about its pivot until its forward extremity impinges against the right-hand extremity of guide rail 35. An opening, or counter-clockwise movement, urge is imparted to the gate by a torsion spring 40, shown in Figure 2. Figure 2 also shows the boss I,

above mentioned, a stationary post 32 extending upwardly therefrom, and the gate 32 mounted for swinging movement about the post 32 and bearing on the boss I. Secured to the top of post 32', as by a screw 42, is an inverted cup member 4I, within which is retained the spring 40 having its extremities respectively secured to the cup member 4I and the gate 32. The torsional force of spring 40 may be regulated by rotation of the cup member 4I with respect to the gate 32, and the desired regulation thereof may be maintained by tightening the screw 42.

Besides the stud 3I and the gate 32, the movable support for the right-hand mandrel extremity includes a latch 33 adapted to maintain the gate closed against the torsional force of spring 40 and against the gravitational tendency of the mandrel to disengage the stud 3I and thus open the gate. The latch includes a horizontal shank 31, which is secured to a vertical pin 34, swivelling in guide rail 35, and is adapted to swing in a horizontal slot 36 provided in the righthand end portion of the rail. The most rearward, or most counter-clockwise, contemplated adjustment ofthe latch is that illustrated in Figure l, wherein, assuming the gate closed, as illustrated, the shank 31 protrudes rightward through a slot 33 formed in the forward extremity of the gate. The latch is maintained in this adjustment until deliberately moved, to in turn maintain the gate tightly closed, by a catch member 38. This member is in the form of a washer 38 surrounding the latch shank 31 and is provided with an outwardly extending annular flange 38" which partially surrounds the base 39 of a knob 39 formed at the end of the shank. The catch member 38 is urged inwardly along the shank 31 by an expansion spring 50 surrounding the shank within the flange 38 and terminally engaging the washer 38' and the knob base 39. This latch detail is shown in Figure 3.

The operation of dlsengaging the right-hand end support from the mandrel consists in pulling forwardly on the knob 39, whereupon the catch member 38 is forced slightly to the right and permits the latch to swing forwardly to a position in which it is disengaged from the gate 32. The gate thereupon swings counter-clockwise to open position under the action of the torsion spring 40. The reverse operation of engaging the right-hand end support with the mandrel of course consists in rst closing the gate and then moving the latch counter-clockwise to the illustrated gate engaging position.

Reference is now had to Figures 4 and 5, which respectively include elevational and cross-sectional Views of the conically-pointed stud 3l. Extending inwardly of this stud from its outer or right-hand extremity is a cylindrical hole or recess 52, and partially projecting into this recess is a, plunger 53. The plunger is provided with an enlarged outer end portion 53', which by impingement against the outer extremity of the stud 3| will limit mutually contractive movement of the plunger and stud. Mutually expansive movement of these members is limited by the head 54 of a screw 54 which passes freely through the plunger and is secured to the stud at the base of the recess 52. The screw 54 is so adjusted as to permit some relative movement F of these members. An expansive moving urge is imparted to such members by a coiled spring 55 encircling the screw 54 and terminally impinging against the inner face of the plunger and the base of the recess 52. The enlarged portion 53 of the plunger is provided with an annular groove 53". The stud 3| has a at surface portion 3|', and along the upper portion of the stud is an oil groove 58 inclined downwardly to near the point of the stud.

The gate 32 has two oppositely disposed bosses 49' and 49 which when the gate is closed respectively project inwardly and outwardly and which jointly form in the gate what may be considered a boss portion 49. Extending horizontally thro-ugh such boss` portion is a ho-le 5|, and when the gate is closed this hole is in axial alignment with the mandrel. The stud 3| fits slidingly in this hole and normally projects from each side of the boss portion, the enlarged plunger portion 53 being exposed adjacent the face of the boss 49". A screw 56 extends through the boss portion 49 into approximate engagement with the at portion 3| of the stud so as to prevent appreciable turning of the stud within the hole 5|, but is so arranged as not to prevent some longitudinal movement of the stud. A vertical oil hole 59 is provided in the boss portion 49 and normally communicates with the oil groove 58 in the stud. Into the boss 49", near the hole 5|, is threaded a screw 51 having a Wide iiange 51 which forms a part of the screw head and which normally engages the annular groove 53 of the plunger. On turning the screw 51 the flange 51', and hence the plunger 53, is moved in a direction paralleling the hole 5|, this screw therefore comprising a position adjusting means for the plunger. The screw 51 and plunger 53 may be secured in any desired adjustment by means of a lock nult 51 threaded on the screw., W'hen the gate 32 is opened and stud 3| therefore disengaged from the mandrel, the stud will respond to the urge of spring 55 and will move in the hole 5| in the direction away from the plunger head 53', which movement is, of course, limited by the screw' head 54.

The construction and arrangement are such that in the operation of closing the gate 32 the stud 3| will fully engage the conical recess and force the mandrel shaft 9 into full engagement with the stud 30, be fore the gate is quite wholly closed, whereby during the final portion of the gate closing operation the stud 3| will be forced to the right with respect to the gate and against the urge of spring 55, but not quite fully into engagement with the enlarged plunger portion 53. 'Ihe screw 51 may be readily so adjusted that these actions will take place. Thus in the apparatus as so far described, the stud 3| is biased with respect to the gate in the direction of the mandrel and therefore thrusts or is biased against the mandrel both during the last portion of the gate closing operation and while the gate remains closed.

The bias or thrust of the bearing stud 3| against the mandrel during the last portion of the gate closing movement is quite advantageous in insuring at the completion of that movement, intimate engagement of the mandrel and its end supports; but during mandrel rotation it is detrimental for reasons hereinbefore indicated. According to the present invention the bias of they stud against the mandrel is effected and retained during part of the operation of engaging the right-hand end support with the mandreli. e., during the last portion of the gate closing movementbut upon the completion of that engaging operation the stud is automatically locked in the position which it then occupies-i. e., locked with respect to the gate and hence with respect to the mandrel. This locking function may be performed by a locking device which is responsive to the engagement of the latch 33 with the gate 32-i. e., to the final step performed in the operation of engaging the right-hand end support with the mandrel, which stepy is performed only after the gate is wholly closed. I have illustrated two forms of such locking device, one in Figures l to 4 and the other in Figures 6 to 9.

In the construction shown in Figures 1 to 4, the boss 49 of gate 32 is provided with a vertical slot 6| which is parallel to the face of the boss and extends rearwardly from the forward surface portion of the boss somewhat more than half-way therethrough. Into the slot 6| extends an inclined arm 62 which is of a thickness substantially equal to the slot width. The upper end portion of this arm is preferably somewhat reduced in width and is curved closely about the stud 3| to form an almost-closed and generally U-shaped collar 65. In the outer edge and near the extremity of the free leg 65' of the collar 65 is formed a small curved recess 65, this recess being located within the slot 6| below and somewhat rearwardly of the stud 3|. the recess 65", and located principally within the slot 6| but extending slightly outwardly therefrom, is an eccentric 63-i. e., a circular washerlike member having a transverse eccentric hole therethrough. I'he eccentric 63 is mounted on a horizontal screw 64 having a long head 64 which freely ts a hole 61 in the boss portion 49 and having a shank portion 64" which is in threaded engagement with the wall of said hole.

The arm 62 tends to move downwardly and rearf wardly under its own weight about the stud 3| as a pivot. The eccentric 63,` however, directly limits such movement of the arm 62 and thus establishes a normal angular position for the arm about the stud 3|.

'Ihe arm 62 extends downwardly and forwardly from slot 6|, and is provided with an offset 62 which brings the terminal portion 62 of the arm beneath the catch member ange 38 of latch 33, assuming gate 32 closed and the latch engaged therewith. The terminal portion 62 is extended upwardly to form a cam 56. The parts are so arranged and adjusted that when the latch 33 is disengaged from the gate, the top surface 66 of the cam 66 will be elevated to lie in the path to be traversed by the catch member flange 38 when the latch is being engaged with the gate. The collar 65, while closely surrounding the stud 3|, does not then produce sufficient friction therewith to interfere with movement of the stud in its mounting. When, however, the latch is moved in an anti-clockwise direction about its pivot to engage the gate, the catch member flange 38 impinges against the cam surface 66' and forces the cam 66 and arm 62 downwardly. Since the eccentric 63 prevents any attendant movement of the collar leg 65', the collar will thereupon be constricted and pressed tightly against the stud 3| so as to clamp or lock the same. So long as the latch 33 remains in gate engaging positioni. e., so long as the latch holds the right-hand end support engaged with the mandrel-the collar 65 remains constricted and firmly clamps or locks the stud 3|.

The screw 64 may be loosened and the eccentric 63 turned to any desired position (the slight projection of the eccentric from slot 6| facilitating this operation), and the eccentric may then be locked in such position by tightening the screw. This provides a convenient means of adjusting,

Engaging within limits, the normal elevation of the cam surface 66', and hence the degree to which the collar 65 will be constrcted, so as to clamp or lock the stud 3| when the latch is engaged with the gate. An additional adjusting feature is desirably, but not indispensably, provided. This comprises a boss 68 extending downwardly from the forward extremity of the gate 32, and a horizontal eccentric 69 secured to the boss by a screw 10. On loosening the screw 10 the eccentric 69 may be angularly adjusted to bear lightly against the terminal arm portion 62, whereupon it may be secured in adjusted position by tightening the screw. The eccentric 69 then provides a stop for preventing leftward movement of the arm portion 62 which may tend to occur as an incident to the downward pressure exerted thereon when latch 33 is moved to gate engaging position.

A vertical apron 99 is secured to and extends downwardly from the face of boss 49. This apron acts as a guard to prevent the impinge- Vment of the record l2 against the arm 62, in the event of accidental manipulation of the record ejecting device S8 while the gate 32 is closed.

In the case of the locking device illustrated in Figures 6 to 9, the boss 49 of gate 32 is provided with a horizontal hole 1| extending at right angles to the hole 5| and intercepting a small lower portion of the latter. A rod 12 is disposed in the hole 1| and extends slightly rearwardly and for a considerable distance forwardly of the boss 49. The rod 12 where it is adapted to project into the hole 5|, is provided with an upper flat surface portion 12', and in this form of my invention the stud 3| is provided with a lower fiat surface portion 3| extending from a point intermediate the length of the stud to its pointed extremity. Normally the planes of the fiat surface portions 12' and 3|" are both horizontal and very slightly spaced; accordingly the rod 12 does not then interfere with movement of the stud 3| in its mounting. Upon a slight rotary movement of the rod 12, however, an edge of the flat surface portion 12 will be brought into engagement with the flat surface portion 3| of stud 3 and if sufficient rotative force be applied, will clamp or lock the stud. The requisite rotary movement of rod 12 is effected, as hereinafter described, in response to the operation of engaging the latch 33 with gate 32, wherefore that operation causes the locking of stud 3|, as in the case of that form of locking device above described.

On the forwardly extending portion of the rod 12 is carried a flat member 13, the rod extending through a rear lug 13' and a forward flange 13" which project downwardly from said member at right angles thereto. The lug 13 is spaced from the boss 49 by a loose fitting spacing sleeve 15; and the member 13 is held in place longitudinally of the rod 12, and the rod in turn longitudinally positioned, by means of a flange 12" formed on the forward extremity of the rod and a collar 16 secured to the rod just to the rear of boss 4S. The member 13 and its ange 13l extend from the rod 12 above the gate 32, and when the iiange 13" rests upon the gate member 13 is substantially horizontal. A normal angular relationship between member 13 and rod 12 is established by biasing mea-ns in the form of a torsion spring 14 surrounding the rod between lug 13 and fiange 13" and having its ends respectively impinging against the bottom of member 13 and secured to a pin 14 carried by rod 12. Spring 14 is so arranged that when flange 13, in response to gravity, rests upon gate 32 the flat portion 12 of rod 12 will be substantially horizontal, or at least will be so positioned as to exert a negligible clamping force on stud 3|.

At its right-hand extremity the flange 13 of member 13 is bent forwardly to form a vertical cam 11 which extends above the catch member ange 38", assuming the latch 33 to be in gate engaging position. When the latch 33 is rotated clockwise to disengage the gate, the member 13 is permitted to assume its substantially horizontal position in which the stud 3| is unlocked. The shape and disposition of the bottom edge 11' of the cam 11 are such, however, that upon movement of the latch 33 to full gate engaging position the catch member flange 38" will engage the cam edge 11', raise the cam, and turn member 13 upwardly about rod 12. In response to the action of spring 14 the rod 12 will then turn, and an edge of the iiat surface portion 12 thereof will be brought into engagement with and pressed against the flat surface portion 3| of stud 3|, thereby locking the latter.

The term record as used in this specification and in the appended claims, is intended to apply to a sound record tablet regardless of whether the same is blank or is provided with sound record grooves.

It will be understood that while I have illustrated and described my invention in terms of specific embodiments thereof, I intend no unnecessary limitations by virtue of the details of such embodiments, but rather undertake to express the scope of my invention in the following claims.

I claim:-

1. A phonographic record mount including, in combination, a. record-carrying mandrel; a support for said mandrel movable for selective engagement therewith and disengagement therefrom; a bearing device resiliently arranged on said support and forming the mandrel-engaging portion thereof; and means, carried by and responsive to the engagement of said support with said mandrel, for locking said bearing device to said support.

2. A phonographic record mount including, in combination, a record-carrying mandrel; a support for said mandrel movable for selective engagement therewith and disengagement therefrom; means for securing said support in such engagement; a bearing device resiliently arranged on said support and forming the mandrel-engaging portion thereof; and means, actuated by said securing means, for locking said bearing device in said support.

3. A phonographic record mount including, in combination, a record-carrying mandrel; a disengageable thrust bearing for said mandrel; means comprising a member movable towards and away from said mandrel for moving said bearing into engagement with said mandrel and for maintaining said engagement, at will; means operative when said bearing is moved into said engagement for producing a bias of said bearing 'against said mandrel; and means carried by said member and operative While said engagement is maintained for locking said bearing against said bias.

4. A phonographic record mount including, in combination, a record-carrying mandrel, a dis- `eng'ageable thrust bearing for said mandrel; a

member movable to a position adjacent said mandrel, said bearing being carried by and arranged for limited movement relative to said member; means for biasing said bearing with respect to said member in the direction of said mandrel,

whereby movement of said member toward said position first effects engagement, and thereafter a bias, of said bearing against said mandrel; means for securing said member in said position; and means, actuated by said securing means, for locking said bearing with respect to said member.

5. In a phonographic record mount including a record-carrying mandrel; a disengageable support for said mandrel including a movable gate selectively maintainable in open and closed positions and a bearing stud resiliently arranged for limited longitudinal movement on the gate and adapted to thrust against the mandrel as the gate approaches closed position; and means, carried by said gate, for locking said stud thereto while the gate is maintained closed.

6. In a phonographic record mount including a record-carrying mandrel; a disengageable support for said mandrel including a gate selectively movable to open and closed positions and a bearing stud resiliently arranged for limited longitudinal movement on the gate and adapted to thrust against the mandrel as` the gate approaches closed position; a latch arranged for engagement with said gate when the gate is closed; and means, responsive to said latch engagement, for locking said stud to said gate.

7. In a phonographic record mount including a record-carrying mandrel; a disengageable support for said mandrel including a movable gate selectively maintainable in open and closed positions and a bearing stud resiliently arranged for limited longitudinal movement on the gate and adapted to thrust against the mandrel as the gate approaches closed position; and means for locking said stud to said gate comprising a collar embracing the stud and supported on the gate against movement in a direction lengthwise of the stud, and means for constricting said collar about said stud.

8. In a phonographic record m-ount including a record-carrying mandrel; a disengageable support for said mandrel including a gate selectively movable to open and closed positions and a bearing stud resiliently arranged for limited longitudinal movement on the gate and adapted to thrust against the mandrel as the gate approaches closed position; a latch movable to engage said gate when the gate is closed; a collar embracing said stud and supported on said gate against movement in a direction lengthwise of the stud; and a collar-constricting arm extending from said collar into the path of movement of said latch for actuation thereby.

9. In a phonographic record mount including a record-carrying mandrel; a disengageable support for said mandrel including a gate selectively movable to open and closed positions and a bearing stud resiliently arranged for limited longitudinal movement on the gate and adapted to thrust against the mandrel as the gate approaches closed position; a latch movable to engage said gate when the gate is closed; a U-shaped collar embracing said stud and supported on said gate against movement lengthwise of the stud; means for adjusting the angular position of one leg of said collar with respect to said stud;V and an arm extending from the 4other leg of said collar into the path of movement of said latch whereby to press such other leg against said stud upon engagement of the latch with said gate.

10. In a phonographic record mount including a record-carrying mandrel; a disengageable support for said mandrel including a movable gate selectively maintainable in open and closed positions and a bearing stud resiliently arranged for limited longitudinal movement on the gate and adapted to thrust against the mandrel as the gate approaches closed position; and means for locking said stud to said gate comprising a rod rotatably supported by the gate, said rod being provided with a stud engageable portion normally out of engagement with said stud, and means for imparting a rotative movement to said rod thereby to bring the said portion thereof into engagement with said stud.

1l. In a phonographic record mount including a record-carrying mandrel; a disengageable support for said mandrel including a gate selectively movable to open and closed positions and a bearing stud resiliently arranged for limited longitudinal movement on the gate and adapted to thrust against the mandrel as the gate approaches closed position; a latch movable to engage said gate when the gate is closed; a rod rotatably supported on said gate, said rod being provided with a stud engageable portion normally out of engagement with said stud; and means for imparting a rotative force to said rod, said means extending into the path of movement of said latch for actuation thereby.

12. In a phonographic record mount including a record-carrying mandrel; a disengageable support for said mandrel including a gate selectively movable to open and closed positions and a bearing stud resiliently arranged for limited longitudinal movement on the gate and adapted to thrust against the mandrel as the gate approaches closed position; a latch movable to engage said gate when the gate is closed; a rod rotatably supported on said gate, said rod being provided with a flat portion normally out of engagement with said stud; a member rotatably carried by said rod and extending into the path of movement of said latch; and biasing means connected between said rod and said member whereby rotation of such member imparts a rotative force to the rod.

HEINRICH F. MAX GRAMANN. 

